﻿<!DOCTYPE html>
<html>
<head>
  <title>Using Dimensioning Links</title>
  <!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
  <meta name="description" content="TypeScript: Dimensioning Links show the distance from a spot on a node to another spot on a node." />
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
</head>
<body>
  <div id="sample">
    <div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:400px"></div>
    <p>
      This sample makes use of the DimensioningLink class, which inherits from the <a>Link</a> class. That class is defined
      at <a href="../extensions/DimensioningLink.ts">DimensioningLink.ts</a>.
    </p>
  </div>

  <script type="module" id="code">
    import * as go from "../release/go-module.js";
    import { DimensioningLink } from './DimensioningLink.js';

    if (window.goSamples) window.goSamples(); // init for these samples -- you don't need to call this
    const $ = go.GraphObject.make;

    const myDiagram = $(go.Diagram, 'myDiagramDiv', {
        'undoManager.isEnabled': true
    });
    // A simple resizable node
    myDiagram.nodeTemplate =
        $(go.Node, 'Auto', { locationSpot: go.Spot.Center }, new go.Binding('location', 'loc', go.Point.parse).makeTwoWay(go.Point.stringify), { resizable: true }, $(go.Shape, { strokeWidth: 0, fill: 'lightgray' }, new go.Binding('fill', 'color')), $(go.TextBlock, { margin: 10 }, new go.Binding('text', 'key')));
    // A generalized example template using a DimensioningLink.
    // Most usage might not have so many Bindings.
    myDiagram.linkTemplateMap.add('Dimensioning', $(DimensioningLink, new go.Binding('fromSpot', 'fromSpot', go.Spot.parse), new go.Binding('toSpot', 'toSpot', go.Spot.parse), new go.Binding('direction'), new go.Binding('extension'), new go.Binding('inset'), $(go.Shape, { stroke: 'gray' }, new go.Binding('stroke', 'color')), $(go.Shape, { fromArrow: 'BackwardOpenTriangle', segmentIndex: 2, stroke: 'gray' }, new go.Binding('stroke', 'color')), $(go.Shape, { toArrow: 'OpenTriangle', segmentIndex: -3, stroke: 'gray' }, new go.Binding('stroke', 'color')), $(go.TextBlock, {
        segmentIndex: 2,
        segmentFraction: 0.5,
        segmentOrientation: go.Link.OrientUpright,
        alignmentFocus: go.Spot.Bottom,
        stroke: 'gray',
        font: '8pt sans-serif'
    }, new go.Binding('text', '', showDistance).ofObject(), new go.Binding('stroke', 'color'))));
    // Return a string representing the distance between the two points.
    // This is the cartesian distance if this.direction is NaN;
    // otherwise it is the orthogonal distance along that axis.
    function showDistance(link) {
        const numpts = link.pointsCount;
        if (numpts < 2)
            return '';
        const p0 = link.getPoint(0);
        const pn = link.getPoint(numpts - 1);
        const ang = link.direction;
        if (isNaN(ang))
            return Math.floor(Math.sqrt(p0.distanceSquaredPoint(pn))) + '';
        const rad = ang * Math.PI / 180;
        return Math.floor(Math.abs(Math.cos(rad) * (p0.x - pn.x)) +
            Math.abs(Math.sin(rad) * (p0.y - pn.y))) + '';
    }
    myDiagram.model = new go.GraphLinksModel([
        { key: 'Alpha', loc: '0 50' },
        { key: 'Beta', loc: '150 0' },
        { key: 'Gamma', loc: '100 150' }
    ], [
        {
            from: 'Alpha', to: 'Beta', category: 'Dimensioning',
            fromSpot: 'TopRight', toSpot: 'TopLeft'
        },
        {
            from: 'Alpha', to: 'Beta', category: 'Dimensioning',
            fromSpot: 'TopLeft', toSpot: 'TopRight', extension: 50, color: 'blue'
        },
        {
            from: 'Alpha', to: 'Beta', category: 'Dimensioning',
            fromSpot: 'TopLeft', toSpot: 'TopLeft', direction: 270, color: 'green'
        },
        {
            from: 'Alpha', to: 'Beta', category: 'Dimensioning',
            fromSpot: 'BottomRight', toSpot: 'BottomRight', direction: 90, color: 'purple'
        },
        {
            from: 'Alpha', to: 'Beta', category: 'Dimensioning',
            fromSpot: 'Center', toSpot: 'Center', extension: 50, direction: NaN, color: 'red'
        },
        {
            from: 'Gamma', to: 'Gamma', category: 'Dimensioning',
            fromSpot: 'TopLeft', toSpot: 'TopRight', direction: 0
        },
        {
            from: 'Gamma', to: 'Gamma', category: 'Dimensioning',
            fromSpot: 'TopRight', toSpot: 'BottomRight', direction: 90
        },
        {
            from: 'Gamma', to: 'Gamma', category: 'Dimensioning',
            fromSpot: 'BottomRight', toSpot: 'BottomLeft', direction: 180
        },
        {
            from: 'Gamma', to: 'Gamma', category: 'Dimensioning',
            fromSpot: 'BottomLeft', toSpot: 'TopLeft', direction: 270
        }
    ]);

    window.myDiagram = myDiagram; // Attach to the window for console debugging
  </script>
</body>
</html>